Data decryption apparatus and data encryption apparatus

a technology of data encryption and data decryption apparatus, which is applied in the direction of securing communication, digital transmission, secret communication, etc., can solve the problems of data decryption and processing complexity

Inactive Publication Date: 2011-08-23
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When information on an encryption key is transmitted from a data encryption apparatus to a data decryption apparatus through the same communication path as that used in transmission of encrypted data, the encrypted data and the information on the encryption key can be intercepted, which can result in decipherment of the data.
The conventional technique is, however, disadvantages in that the data decryption apparatus determines which encryption key is to be employed as a decryption key by referring to information on the current time along with information on the flag, which complicates processing.

Method used

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  • Data decryption apparatus and data encryption apparatus
  • Data decryption apparatus and data encryption apparatus
  • Data decryption apparatus and data encryption apparatus

Examples

Experimental program
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first embodiment

[0037]The concept of data encrypting / decrypting processes according to a first embodiment will be explained first. FIG. 1 is an explanatory diagram of the concept of the data encrypting / decrypting processes according to the first embodiment. In the data encrypting / decrypting processes, a data transmitting apparatus 10 encrypts user data and transmits the encrypted data, and a data receiving apparatus 20 receives the encrypted user data transmitted from the data transmitting apparatus 10 and decrypts the data.

[0038]The data transmitting apparatus 10 and the data receiving apparatus 20, which have a voice call function, convert a voice of a user into a voice signal and exchange the voice signal bi-directionally, thereby carrying out a voice call between users.

[0039]The data transmitting apparatus 10 encrypts user data with an encryption key before transmission of the user data. The data transmitting apparatus 10 changes an encryption key to enhance security in transmission of the user...

second embodiment

[0113]The first embodiment has described an example in which the data transmitting apparatus changes an encryption key and transmits information on the changed encryption key to the data receiving apparatus. Alternatively, processing in which a data receiving apparatus changes an encryption key and transmit the changed encryption key to a data transmitting apparatus can be employed. Hence, a second embodiment describes an example in which a data receiving apparatus changes an encryption key and transmits information on the changed encryption key to a data transmitting apparatus.

[0114]The concept of data encrypting / decrypting processes according to the second embodiment will be explained first. FIG. 8 is an explanatory diagram of the concept of data encrypting / decrypting processes according to the second embodiment. In the data encrypting / decrypting processes, a data transmitting apparatus 50 encrypts user data and transmits the encrypted data, and a data receiving apparatus 60 recei...

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Abstract

A data decryption apparatus that decrypts encrypted data, includes a first data-receiving unit that receives a first data set, in which information on an encryption specification is embedded, through a first communication path; a time-information obtaining unit that obtains time information on a reception of the first data set by the first data receiving unit; a time-information storage unit that stores the time information with the information on the encryption specification associated therewith; a second data-receiving unit that receives a second data set through a second communication path, the second data set being encrypted based on the encryption-specification and appended by time information on performing data encryption; and an encryption-specification selecting unit that selects an encryption specification for use in decryption of the second data set based on the time information stored in the time-information storage unit and the time information appended to the second data set.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a data decryption apparatus that decrypts encrypted data and a data encryption apparatus that encrypts data, and, more specifically to a data decryption apparatus and a data encryption apparatus that allow secure and efficient data exchange between the apparatuses.[0003]2. Description of the Related Art[0004]Conventionally, an integrated communication service that carries out data communications of user data, as well as bi-directional communications of multimedia information, such as voice data for a voice call and image data for a video telephone, has been provided. When data to be transmitted must be protected from interception by a third party, the data is encrypted.[0005]To decrypt encrypted data, information on an encryption key used in encryption of the data must be shared between an encryption apparatus that encrypts the data and a decryption apparatus that decrypts the data. To a...

Claims

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Application Information

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Patent Type & AuthorityPatents(United States)
IPC IPC(8): H04L9/00
CPCH04L9/0827
InventorTOGAWA, TAROENDO, KAORIOTANI, TAKESHITANAKA, MASAKIYOOTA, YASUJI
OwnerFUJITSU LTD